*{
    padding: 0;
    margin: 0;
}
body{
    padding-top: 10px;
   
}
.all_bg{
    width: 800px;
    height: 600px;
    margin: auto;
    cursor: url(http://www.51bbw.cn/wp-content/themes/51bbw/images/cursor.ico), auto;
}
#allcanvas{
  position: relative;
  width: 800px;
  height: 600px;
  margin: 0px;
}
#canvas1{
  position: absolute;
  bottom: 0;
  left: 0;
  z-index:1;
}
#canvas2{
position: absolute;
  bottom: 0;
  left: 0;
  z-index: 0;
}